Abstract
Basics of gentle cleansing for skin and hair are reviewed. In general, cleansing is a practice to remove material deposited as a stain from the object to make it clean. Cleanliness is not always the same and depends on the purpose and object. With regard to the skin and hair, gentle cleansing means sufficient removal of deposition while give functionality of skin or hair. In this regard, the effect of a surfactant in view of gentle cleansing should be sufficient enough to refresh the surface while preserving essential molecules on the objects. Key factors for the mild surfactant are discussed along with the cleansing process.